@article{Hinze-bro12,author={Ralf Hinze},
title={Purely Functional 1-2 Brother Trees},
journal={J. Functional Programming},
volume=19,number={6},pages={633--644},year=2009}
@article{HoffmannOD-TOPLAS82,
author={Christoph M. Hoffmann and Michael J. O'Donnell},
title={Programming with Equations},journal={{ACM} Trans. Program. Lang. Syst.},
volume=4,number=1,pages={83--112},year=1982}}
@article{Kahrs-JFP01,author={Stefan Kahrs},title={Red-Black Trees with Types},
journal={J. Functional Programming},volume=11,number=4,pages={425-432},year=2001}
@misc{Kahrs-html,author={Stefan Kahrs},title={Red Black Trees},
note={\url{http://www.cs.ukc.ac.uk/people/staff/smk/redblack/rb.html}}}
@book{Okasaki,author={Chris Okasaki},title="Purely Functional Data Structures",
publisher="Cambridge University Press",year=1998}
@article{OttmannS76,author={Thomas Ottmann and Hans-Werner Six},
title={Eine neue {K}lasse von ausgeglichenen {B}in\"arb\"aumen},
journal={Angewandte Informatik},volume=18,number=9,pages={395--400},year=1976}
@article{OttmannW-CJ80,author={Thomas Ottmann and Derick Wood},
title={1-2 Brother Trees or {AVL} Trees Revisited},journal={Comput. J.},
volume=23,number=3,pages={248--255},year=1980}
@article{Reade-SCP92,author={Chris Reade},
title={Balanced Trees with Removals: An Exercise in Rewriting and Proof},
journal={Sci. Comput. Program.},volume=18,number=2,pages={181--204},year=1992}
@article{Schoenmakers-IPL93,author="Berry Schoenmakers",
title="A Systematic Analysis of Splaying",journal={Information Processing Letters},volume=45,pages={41-50},year=1993}
@article{SleatorT-JACM85,author={Daniel D. Sleator and Robert E. Tarjan},
title={Self-adjusting Binary Search Trees},journal={J. ACM},
volume=32,number=3,pages={652-686},year=1985}
@misc{Turbak230,author={Franklyn Turbak},
title={{CS230 Handouts --- Spring 2007}},year=2007,
note={\url{http://cs.wellesley.edu/~cs230/spring07/handouts.html}}}